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No, that's it: the external battery maintains the light at a constant output, until you're at a sufficient speed for the dynamo to fully power it.
If you plug the output into the battery, then you can charge it as well.
Seems like a well thought out, all-in-one solution (charger priority mode is smart). My only reservation is the exposed ports, but they seem confident it won't be a problem.
Scilly.Suffolk-
Would love to get my hands on that to have a test of it.
Chief issue with the Igaro (both gens) system was 1. reliability 2. Complexity.
Complexity and the amount of wiring could be dealt with, but the reliability always put me on edge.
Had two sets go, and massive kudos to the Igaro guys for being quick off the ball to repair and replace, but still didn't feel 100% at ease.
Chak
Oh, I think I thought it had a cache battery but when I re-read Lael's article it was a connection that allowed a battery to be plugged into it, so it acts as a battery light at lower speeds? Or have I got the wrong end of the stick again?